Viewing archive of Wednesday, 26 February 2003
Solar activity report
Any mentioned solar flare in this report has a scaling factor applied by the Space Weather Prediction Center (SWPC). Because of the SWPC scaling factor, solar flares are reported as 42% smaller than for the science quality data. The scaling factor has been removed from our archived solar flare data to reflect the true physical units.
Report of Solar-Geophysical Activity 2003 Feb 26 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 057 Issued at 2200Z on 26 Feb 2003IA. Analysis of Solar Active Regions and Activity from 25-2100Z to 26-2100Z Solar activity was very low. Today's largest flare was
a B7/Sf at 0946 UTC from Region 290 (N18W60). A few additional
B-class flares were observed, including one from the new active
region on the east limb at S18.
IB. Solar Activity Forecast
Solar activity is expected to be very
low to low.
IIA. Geophysical Activity Summary 25-2100Z to 26-2100Z
The geomagnetic field was at quiet to active levels. An interval of
weakly to moderately negative interplanetary Bz magnetic field (-5
to -10 nT) was observed from 0300-0600 UTC and led to active levels
from 0600-1200 UTC. Solar wind data also showed a density
enhancement and magnetic field enhancement beginning at 1800 UTC,
accompanied by a discontinuous shift in the spiral angle from an
away sector to a towards sector, suggesting a likely solar sector
boundary crossing.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be predominantly unsettled for the next three days, with
a slight chance for some isolated active periods. The somewhat
enhanced levels of activity are expected because of favorably
positioned solar coronal holes.
III. Event Probabilities 27 Feb to 01 Mar
| Class M | 05% | 05% | 05% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 26 Feb 109 Predicted 27 Feb-01 Mar 115/120/120 90 Day Mean 26 Feb 143
V. Geomagnetic A Indices
Observed Afr/Ap 25 Feb 002/005 Estimated Afr/Ap 26 Feb 011/015 Predicted Afr/Ap 27 Feb-01 Mar 012/012-012/012-012/012
VI. Geomagnetic Activity Probabilities 27 Feb to 01 Mar
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 35% | 35% | 35% |
| Minor storm | 20% | 20% | 20% |
| Major-severe storm | 05% | 05% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 40% | 40% | 40% |
| Minor storm | 25% | 25% | 25% |
| Major-severe storm | 05% | 05% | 05% |
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